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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cde51f554e1baf9e7ba7d27a8f768a9564da1ddd4d9e19234700c32e966bd17e' 
  AND token = 'gN2tqvar5yjFmQqJ47/K5u5QfTFSq4QX/ZHKkjHFh3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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