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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b34a2cc3b4587e18658aa7b4ff1e8b6d19f1c9abc0413eac28f18ab3125c2d89' 
  AND token = '3zfyLWOnoHnXbi1bVlVYGpoo2aW0uw2TXEVKzctFXSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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