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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54ac277096b833bcb21fd6e16d5cd1537afde32664a366bb3d1b92b450493a9c' 
  AND token = 'ulTWEKAPHYy2VPEsQ3p7ILgiQQCgQ5TB4C0VZnQJHdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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