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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6c6eca7724c51a80ec964156ce7ba26cf0c1942403c4fe1790e1e71a4bd40b1' 
  AND token = '95Q/hObRW+BxWWvu3SR+oG7omzXG5KDM6MbpOumGB9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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