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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '980654775ded2427d598732e6c77d7cad6dc059e692a0b522c09682520e983fa' 
  AND token = 'bCYe6X/z0BIiKjoKpy1MT0eKuDlfv3Pf+ERYDdJ7B6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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