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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eba8880e69a0c013f2ddc384a7e1779772032c2f7c83d224148f7a0957f158b6' 
  AND token = 'CJn2KhjqzFBjkjoyet3pTtY0KhKDbq2Zk9WHYdm1+NE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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