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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '454e33f898b7b0822e09638bc79be32714d3488bccebe6da2a179b945583da76' 
  AND token = 'AFCSeZOisGkAdvbE/LRdqAZRjK/Eqac9dMXn1seKj5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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