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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47fe2201f197935ae1a45e71e20529a8bb24e41bc9a7b9815941a0f2ccf6629f' 
  AND token = 'u0Dxs8yWFJN4ksA+xnm2hn6aikvlt6mWL4HR6OU9i50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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