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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd06c6f1194ac6015c4777ba8bc6a4a7d99899671b1fda93348afcd57dd4a0dc8' 
  AND token = 'TRuK9SgF5dtOYKog1WXHU6kH6ZaDN2CQeWtJiv8jXZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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