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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0b84dc742fb338bd7f23c01efa4d43de9ef539cf7b2119a4cb392baf24d06df' 
  AND token = '9GnRKinv0QAzpCrGym00vEqhVo21MYRNgG429AlGKqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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