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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4118af32f50468a14602fa6d08794649094dfa2f174511abb811d1ada64d3d31' 
  AND token = 'nXYIYYznrHACqkFQUtEvWpQ+HiPZQGlnslANfYA2ir0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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