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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '498e474442228dbd99e0926832854ae5e6875b20d2c68c994de9cd543fe0d418' 
  AND token = 'p+TfFMuCclCDP0/DYc0pO92V4x1/ACn/PhDcdI8AOJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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