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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8624556e720c38b799f44436767d1da1eec40364d41f868122518aa394537cfb' 
  AND token = 'Ym4WixF6NFdiKkUZ7msbPqc8kZfOT+L1sqfx5bfS6Ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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