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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36ee6b1473cfb13d614c2915f95553f333928604b293e67b68566cfa3e416680' 
  AND token = 'ZWUBsl13PgXnI/NrmPwcwznZQL0bh8Y/SzZbwTUN9ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}