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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1730557472bb448893bb81367ad76583b362aa422b5e9888e014c276d4b8896e' 
  AND token = 'az/wDAbTUy7BbDRpff0pjlR8gUakma8E7D3iEj6Dj1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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