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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abfa94c9cd92cbbea23b70f354956e58c9b9c018b6a4c85b821c6881abff84e3' 
  AND token = 'v6i3OzBOI2WrJZ9Tt2+29csFYc6XnEAOGJUgMymNwy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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