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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '876559399ebf32deb03bb349650ebbdc677c708db2a5ac8b62395a6278ff4b04' 
  AND token = 'uHxWprH/1Ltc+iue+vvOjk/zZ4etgKxba1WLZfP1+9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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