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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad5a74f4ed314a79b306af5299a01f4ba478609561dc847b9da748581e63cd4d' 
  AND token = 'lRvyQ562o3t1K5xxcE/vcfIGkYlDt1R+iafl1Ws1nE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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