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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb0419fda5be547642942c8a468ab0c44ad13847efd9631e1dc1a41809a29945' 
  AND token = 'mbhKU5dJSl5r78IJrUCMGR82by/CIkeA+M8XZese56g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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