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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '245159b03318fe9571c521d7b5db0d1e8f728e717b82484b25ef4f36847b99f6' 
  AND token = 'Fhb7V3dVN9uxTtIQ1BRjW0hWewT/LerRW8Sv5MSFwJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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