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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b843ce06ac1aa4914e087a26d911b9906c19e02f42582d55afd4efdba5561778' 
  AND token = 'NwtuVHkevt0cfm2Q6rKgoBx8yr0xuq8ruFE4wT5IA0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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