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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbbf34bc138303ef96545a21ec54a729a1c4e7187f65993aecd4dd5b184bc08b' 
  AND token = 'EH8IT9hCOF0nKWf16JX2G3xISjPTf/lLsYFr0ZjJsd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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