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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7650cc544b8be88101ff3c1037555f6ddd3b7a74deb266c64d4b092b894959be' 
  AND token = 'OPEw8GB2ZgVTF71w73O7w5XWFWeIVz9+zFf6Ummd6U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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