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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e50a155190dd9487c3668b4f116caf096234edf45f4d8311d928bd91a0d8309b' 
  AND token = 'kAT/OzXl3httQnkWubXUBuZnzAZAh9nQ1TgIh5RbXw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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