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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86fcac42d30655e75219be6c691f05037169516de9d76101ccd2ac39c0d8494f' 
  AND token = 'xOqrFK6KV2agJ9wEUq19928BEFs0GWdluCW3D8vG31s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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