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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93f47aa501de08ce45a4ddab3bfa9a35918103961a18e76ae72cac983812394c' 
  AND token = 'PGjSNWlDaLbbYeMEYxfso54ljVIukhx85qPAre97/NA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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