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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '183701cbd14aa752b7a515b8434c8a2d1243f4b33ce3c08591ea34cf2ceb026b' 
  AND token = '2+pYvmJ10k0/XRflnlQKOtrWBx65ancwX7qVc5Ozn6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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