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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df7a3147c47bc4b111b51f67203bfe8ca8b31178d9e5d7a62a7efe48c198c7df' 
  AND token = 'p3u3mt6P+x2m7MfmjdL0NV5ffc7XU2nd8Vuq3NqsBAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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