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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eade9624c7e41c17695a8f71807d5a93795c94494c6fb8249217f4eec38ffbfb' 
  AND token = 't016rxaQA5MLnogkB1nRJhKZzADcZQQv6FiUuXME4DY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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