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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '890f2f8412eed105057569eda156c4dd6966ddbe0399f8d52f571b197d05462c' 
  AND token = 'WgeCLY/5LHDPLm0QgHVN1iq3pZC+Cka8taWHqAqm+mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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