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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b0a0fd18fa21c85c1695c9fdbbcb4362e8c2b65278783b0e635aa800581d8e0' 
  AND token = 'qX6+7SV04pgz8EFKNa42IxYS9L8ksDgV1+jgLylaQks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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