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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14af406504ee4b291956a89d1f0fa195d4efbd987ec248a4b931c866ad922d1c' 
  AND token = '5qdGhzmDhEQLVCUA0TngX7d8If05iQnJXzLCShlKpt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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