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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '367bd05ea6386850c53ce0ffc0e9d97ee5633ba5a979e3b2d6d5809e11a87b37' 
  AND token = 'RFRqrjjjdlJ5jlZco5vtdUdZakD0UMpjbvb58wauf6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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