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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '908a01ec6d6499e72eebc649c9537fd6a60c2ee8f00954b002b70079a9d5369a' 
  AND token = '/JiFZJnwMbaYRJVLR7GiQZ9Df5xcZwDDhYd8f5wSqs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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