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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80605d5a8390ef02ddef900c5bd0248c1b5fc249dc36ddb32e1cd74d57749e02' 
  AND token = 'l67eJ/lY/7RNa6kfmb2nmooSo+Ja+wE10TTu0KqFE2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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