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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc74afc791b9f69a5db71c1e46e06849cc899166405ec2e67b51446592b9c8e8' 
  AND token = '5SS1pE9Igo8gtf4aERxO5SD0rEwO0OIpl8LHrFkQf6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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