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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dca20b9201268c43f20e015552e1ffc2d982d845c1aba824a68b6f3452c32f4e' 
  AND token = 'q9XN7NeJMk45UjEaqFdC4UV0bJxIbH/SeQrqcXvUsi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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