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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd341034d2192241d237a2bc450ecc34e8fea39cbe97f8249e272cfedf6350dec' 
  AND token = 'KQXwEXmoAOGFoBt68rYITZ3S2u6aLdE5/oFOpehHeUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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