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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed7fc02f8aec1ecc84b8d66eb1b7ad88bbac9bcbce121ec85140a19706a1cd54' 
  AND token = 'U3ry2D0VNuYjqYW4SbtcKOWJHP1FOd6cw66vnqZgjJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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