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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f46612c3fb9e333c785d4714c47a17262c2ce3b7e113880bc071174491e0fc21' 
  AND token = 'Bm77uc7aJIDT4a+7Su8JO+A08IEbXZ9jw44C5ByJEfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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