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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf4b147794158c1905190d929d97e1904c82815ffb5186e5fa34503730d18103' 
  AND token = '9RnmMnNlt7Z+XpcpWFgOP+aufswOrEtRRLg1dRMX+lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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