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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8d0f300d3324ef342be758bb5aa796c1ec4013a713192bfc0eb48b528973d3a' 
  AND token = 'mUsdPENaOepC7aKJvzS/0CaTeG5XpASw5HfzZL6Y1jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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