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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b0faea15228c908f0768a34b2d5af9dac20ecf11f0afdc817841d685c79d66f' 
  AND token = 'gC0yNi+YfbvcMCrlHmReHwy5c53OL3LUiGfFk9eGqMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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