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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b3fc2d431cf49da2dc64549ef9e45e6fed8c867b6866edcb90da0764e2682a' 
  AND token = 'ho0AGXd8JK9vCG59nTy5J89M7tlOGcG6u9hgWLMNEdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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