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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e68972df639fcfdbadaeece742b1a3338606c594440b8b980717898f78caac8' 
  AND token = 'ogN/X4r101hPv80H7V26Y4GSwROyT+V1Fd2szzi5wEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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