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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b068c1ad741b632ca939080cfe8b0d4ba05c41ecdd545011bb91a1433f71d117' 
  AND token = 'fZnKNKyNBE8+6v24nPEZM6RHFOWJEfeVW5dxnXrsePs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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