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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8af6d5e8661de90c90f43f0e310bf85d7ec57b63bea583257249b6c0157507c6' 
  AND token = 'PQ/ivuCYVdwBc87IBt8vKEHlExzMCfCeHa4AVB+PFEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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