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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa7c5e95318f28853c49679c070aabe70744782fe4a0693573a2f3d7f2540104' 
  AND token = 'nGlGStDieVkD0v29dxMgk+ev3iEZbZ0D6ICqgn2c6H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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