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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d6b8e874280952ec6b919811a40b213c15a4e6f7059eb8f380229200a1ba89d' 
  AND token = 'HpCOzFvk3DeuQ5rXCFeYXCuCBI42/VF76J9Nxj96UjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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