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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dce6c76f577fa622cd03624685cdaee5498d60f9d8d6bfed97411f83dde4b63' 
  AND token = 'JCrUIamC6drg250SMVTlSWuJ9HNXHgVfs2WR2CUKg6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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