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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd59c21e89817cb3299971045b279ffbd8f7b2c775f85c6a87ff0d4ab3cf02b27' 
  AND token = '4q3uo5LYlhWnwNZ64VEMrnGfdk8KBkhWOWMYkWFdLT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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