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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '241515247885884f7a58a16e6304d5d75a56867fc24f172a7561461c0d7336a5' 
  AND token = 'b93zD92X3XnNhBJ0JK1Ut5/OsAq7zhhStq330sK4VDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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