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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a2e02769ed9381aafabb3be1fa5a37fe1de6f5744888473a5228156a9d3e195' 
  AND token = 'SsvSI61AMfhxLPNsG3sIGsp/+6HYZOWtFBZ6Cxl1INM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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