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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e70793cc086a5136dd6a6125b1c103b6cb752f7b0694f5de41b787a798f7a79' 
  AND token = 'fK0m5uz7KhPQUUT7YmOtSB9Eh0tQz5iJIOo5dL2hoo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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