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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebffd9b1a12d12f9f82da2b7ecfe6d15061ebe05d72fba3ca0348b0076bd8b4f' 
  AND token = 'iTy7/cdYaozInD0zgl/rkGu9knKVCPTko3LrmmEjNfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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