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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eaabafdf39d39a2ecb4ab38636178fc593ca4a01a3b6fc3f30c84fb8bc8e0d4' 
  AND token = 'SMfqbqN/Xc8vwgLTLYtvjdD5Cpn0b9mshLXTMd5PrRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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