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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfc0f942536c11e78eb41412509edcc30ff1150d8439e370f9fb88821b7ac3cd' 
  AND token = 'rfolf5du0mgj6EaarJ+/fssnfMMK/NMYUfb7lEVuhyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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