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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ca7187f935d35d8ff7c82e39677207c9f1006c54a557133a5e4d3f742cbece' 
  AND token = 'm5WOf+9NiSwqsOF2x+7fmi8Iah3EbDgQ4r1IknyWju4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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