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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94460a0b8c34cfef6c44f8ead3bdf2a151852a28da0522a01295f126aa29c5e8' 
  AND token = 'DdEi6TjkssJid0DZCNLDMP0zXXmK9nAu0VZs+B6d9kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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