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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08d07660ca54f4168c980906d3c6df3dd607b8efd80118a4282798f95d953ca0' 
  AND token = 'mqXjNsTxML2n9/sjNkY8ZDtO5Jb3rd6FT5It9xSnTm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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