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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7587d0fe013bcb6ab5349b3da9281ffc55bdd9db3ca683e1a5d56f1bc9149a54' 
  AND token = 'wKfwfdT+GxwjxBlwMU4VPdY3Z8AP+wkeXcNd708nx8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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