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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa65c8d215b23450bc2e41e83e898197e5621bf1a9f4a32e48fa7cc91908156f' 
  AND token = 'zKH2QHiy9QuUZM25LhD0eHUZiezavo8q0axVSIap9wM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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